snowy, there is an "off brand" version of OneBank that someone other than the original author touched up enough to make it work with WotLK until the original author finds the time to make it work. You can find it on curse. I use ArkInventory myself, but my wife doesn't really need that level of customization, so I have her set up with OneBag and the fake OneBank and she likes them just fine.
Turns out I'm kind of a liar and kind of a bringer of good news.
I couldn't find the fake OneBank I found for my wife, but I did find a beta rewrite by the original author here:
http://wow.curse.com/downloads/wow-a.../onebank3.aspx. Enjoy.